Bently Nevada 330101-20-36-10-02-00 3300 XL 8 mm Probe

Product Overview

The Bently Nevada 330101-20-36-10-02-00 is a 3300 XL 8 mm Probe with a 3/8-24 UNF thread, designed without armor for standard industrial environments. This eddy-current probe measures shaft displacement and vibration with high precision, making it a cornerstone of modern machinery protection systems. The probe features a patented TipLoc molding method for a robust bond between the probe tip and body, and a CableLoc design providing 330 N (75 lbf) pull strength to secure the cable and tip. The 8 mm diameter offers thicker encapsulation of the probe coil in molded PPS plastic, enhancing ruggedness against physical abuse.

Technical Specifications Breakdown

Key parameters for the 330101-20-36-10-02-00 are listed below for quick reference:

Industry Applications

Turbine Shaft Vibration Monitoring

In steam and gas turbines, the 3300 XL 8 mm Probe is installed near bearings to measure radial vibration. The -9 Vdc recommended gap setting (approximately 1.27 mm or 50 mils) provides optimal sensitivity for detecting early signs of imbalance or misalignment. The probe's linear range of 2 mm (80 mils) covers typical vibration amplitudes, while the 7.87 V/mm scale factor ensures consistent readings across multiple units.

Compressor Protection

Centrifugal and axial compressors in oil and gas facilities benefit from the probe's robust design. The stainless steel case (AISI 303 or 304) resists corrosion, and the PPS tip withstands temperatures up to +177°C. The 330 N pull strength of the CableLoc design prevents cable detachment in high-vibration environments, reducing false trips and maintenance interventions.

Pump Condition Monitoring

For large industrial pumps, the probe's 1.0 meter cable length allows flexible mounting near the shaft. The miniature coaxial ClickLoc connector simplifies installation and replacement. The extended temperature range option (up to +218°C for the tip) is available for high-temperature pump applications, though the standard probe is sufficient for most environments.

Installation & Setup Guidance

When installing the 330101-20-36-10-02-00, ensure the probe tip is clean and free of debris. Use the 3/8-24 UNF thread to mount the probe securely into a threaded hole in the machine casing. For standard forward mounted probes, the recommended torque is 11.2 N•m (100 in•lbf) for the case, and 7.5 N•m (66 in•lbf) for the first three threads. The maximum rated torque is 33.9 N•m (300 in•lbf) and 22.6 N•m (200 in•lbf) respectively. Do not exceed these limits to avoid thread damage. Set the gap to achieve -9 Vdc output, corresponding to approximately 1.27 mm (50 mils) from the target. Connect the miniature coaxial ClickLoc connector to the extension cable, ensuring a secure click. Field wiring should use 0.2 to 1.5 mm² (16 to 24 AWG) three-conductor shielded triad cable, with a maximum length of 305 meters (1,000 feet) between the Proximitor Sensor and the monitor.

Maintenance & Reliability

Inspect the probe and cable periodically for physical damage, especially in high-vibration or high-temperature environments. The probe's relative humidity tolerance is less than a 3% change in Average Scale Factor (ASF) when tested in 93% humidity per IEC standard 68 2 3 for up to 56 days. Avoid exposing the probe to temperatures below -34°C (-30°F), as this may cause premature failure of the pressure seal. The probe sealing material is a Viton O-ring, designed to seal differential pressure between the tip and case. For applications requiring pressure seal testing, contact the custom design department. The standard probe operates reliably from -52°C to +177°C (-62°F to +350°F).

Solving Vibration Monitoring Challenges in Rotating Machinery

Industrial rotating machinery—such as turbines, compressors, and pumps—faces constant threats from shaft vibration and misalignment. Without precise, reliable measurement, minor imbalances can escalate into catastrophic failures, causing unplanned downtime and costly repairs. The Bently Nevada 330101-20-36-10-02-00 3300 XL 8 mm Probe offers a proven solution for accurate, real-time vibration monitoring, helping engineers detect issues early and maintain operational integrity.

Compatibility & Integration

The 3300 XL 8 mm Probe is designed for use with Bently Nevada 3300 XL extension cables and Proximitor sensors. The standard 1.0 meter system provides an Incremental Scale Factor of 7.87 V/mm (200 mV/mil) ± 5% over the linear range from 0°C to +45°C (+32°F to +113°F). For longer cable runs (9 meter systems), the ISF tolerance is ± 6.5%. The deviation from best fit straight line (DSL) is less than ±0.025 mm (±1 mil) for standard 1 or 5 meter systems. The probe is compatible with most Bently Nevada monitoring systems that accept eddy-current probe inputs.

Selection Guide & Purchasing Advice

When selecting a replacement or new probe, verify the thread size (3/8-24 UNF) and cable length (1.0 meter) match your application. The 330101-20-36-10-02-00 is the standard configuration without armor, suitable for clean environments. For harsh conditions with potential cable abrasion, consider an armored version. Contact our team to confirm lifecycle status and availability before ordering, as product lifecycle information may vary.

Please verify current lifecycle status and availability with AutoDCSTech before ordering.